essential to life, but too much can cause algae and plankton to over produce

11.

1.able to be maintained

12.

a lake that stores water for human use

15.

an area where ocean water sinks through cracks in the ocean floor, heating the water

16.

measure of the average energy of motion of the particles of a substance

17.

a land area that is covered with a shallow layer of water

20.

combined force of attraction among water molecules and water molecules and another surface

22.

the amount of heat needed to increase the temperature of a substance

23.

bouyant force of an object is equal to the weight of the fluid displaced

25.

the amount of dissolved salt in a water sample

26.

a well in which water rises due to pressure within the aquifer

27.

organisms that live on the bottom of the ocean

28.

the degree of purity in the water

31.

the production of light by living things

32.

the process by which plants make their own food

35.

an area where fresh water and salt water meet

36.

a molecule that has electrically charged areas

38.

tiny algae that float in water

39.

tightness across the surface of a molecule

40.

the change in state from a gas to a liquid

41.

the process by which particles in a liquid clump together

44.

water that falls to Earth as rain, snow, sleet or hail

47.

the substance dissolved by the solvent

48.

the introduction of harmful substances into the environment

51.

the farming of aquatic organisms such as fish, crustaceans, molluscs and aquatic plants

54.

the responsible planning and management of resources

56.

a continuous range of mountains on the ocean floor

57.

the top of the saturated zone

58.

water easily passes through

59.

removal of salt from water

61.

a substance that causes the pollution

62.

upward force exerted by a fluid

64.

a rapid increase in the population of algae in an aquatic system

65.

having the ability to float

68.

mass divided volume

69.

the source of the pollution is known

71.

Nitrate is a compound that is formed naturally when nitrogen combines with oxygen or ozone; souces: fertilizer, soil, human waste

72.

a large stream of moving water

73.

a deep canyon in the ocean floor

74.

the place where an organism lives

75.

environmental protection agency

Down

1.

makes up 3% of Earth's water

2.

filled up; holding as much as possible

3.

the land area that supplies water to a river system

4.

continuous process by which water moves from Earth's surface - atmosphere - back

7.

the measure of how basic or acidic a substance is

8.

a ridge of land that separates one watershed from another

9.

a gently sloping area that extends outward toward the edge of a continent

10.

a solvent that has the ability to dissolve many substances

13.

water does not easily pass

14.

a steep incline of the ocean floor leading down from the shelf

18.

the source of the pollution is not known

19.

process by which nutrients in a lake buildup over time causing algae growth

21.

the existence of a wide variety of plant and animal species in their natural environments

24.

plants give off water vapor through their leaves

26.

a smooth nearly flat region of the deep ocean floor

29.

movement of cold water upward from the deep ocean

30.

the smaller streams that feed into a main river

33.

water that fills the cracks and spaces in underground rock layers

34.

uses sound to calculate the distance of an object

37.

the amount of one material in a certain amount of another material

42.

an organism that reveals the presence of the pollutants by the occurrence of measurable symptoms

43.

water is attracted to itself

45.

temperature and precipitation of an area over a long period of time

46.

the substance that does the dissolving

49.

a substance that enables plants and algae to grow (phosphate/nitrates)

50.

process of passing water through a screen to removal unwanted particles

52.

process by which a liquid changes into a gas

53.

water is attracted to other substances

55.

a mixture where one substance is dissolved into another

60.

the clarity of the water

63.

an underground layer of rock that holds water

66.

feeding relationship in a habitat

67.

free swimming organisms that move through the water column

70.

object-locating system

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